[arch-general] UTC

[Leonid Isaev]

On Tue, 19 Feb 2013 17:02:54 +0100
Kwpolska <kwpolska at gmail.com> wrote:

> On Tue, Feb 19, 2013 at 3:00 AM, Ralf Mardorf
> <ralf.mardorf at alice-dsl.net> wrote:
> > On Tue, 19 Feb 2013 01:40:10 +0100, Tom Gundersen <teg at jklm.no> wrote:
> >>>
> >>> # timedatectl set-local-rtc 1
> >>> Failed to issue method call: Input/output error
> >>
> >>
> >> That message is disconcerting (at least the error message should have
> >> been clearer). Could you have a look in "journalctl" (as root) to see
> >> if you can get more information about what went wrong?
> >>
> >>> Sometimes I don't get an output when running "timedatectl set-local-rtc
> >>> 1".
> >
> >
> > Resp. one time.
> >
> >> That means it succeeded.
> >
> >
> > Hi Tom,
> >
> > I don't know how to use journalctl, to get some useful information.
> >
> > [snip]
> >
> >
> >> If I remember correctly, one of the side effects of having your RTC in
> >> localtime is that nothing will write to the RTC automatically.
> >
> >
> > Correct for my new Arch Linux install.
> >
> >
> >> I know you don't want to hear about the problems with localtime, but
> >> to anyone else stumbling upon this: not having your RTC in UTC is
> >> broken and will cause problems.
> >
> >
> > It doesn't cause an issue in 10 years, but for sure using UTC usually is
> > the better choice, if you don't want to have the local time for the BIOS,
> > e.g. for timestamps when storing BIOS settings, that by the way are limited
> > anyway.
> > For personal historical reasons currently all my *NIX expect local time.
> >
> > Regards,
> > Ralf
> 
> If you really, REALLY want this:
> 
> 1. make the last line of /etc/adjtime say “LOCAL”.
> 2. pacman -S ntp
> 3. Run the following script, then run it whenever you think your clock
> is incorrect (as root).
> 
> #!/bin/bash
> ntpdate de.pool.ntp.org
> hwclock --set --date "$(date)"
> 
> --
> Kwpolska <http://kwpolska.tk> | GPG KEY: 5EAAEA16
> stop html mail                | always bottom-post
> http://asciiribbon.org        | http://caliburn.nl/topposting.html

Notice, however, that ntpdate is going for deprecation in favor of ntpd -q and
ideally both should be replaced by the ntp daemon. See man 8 ntpdate for
drawbacks of running this program.

-- 
Leonid Isaev
GnuPG key: 0x164B5A6D
Fingerprint: C0DF 20D0 C075 C3F1 E1BE  775A A7AE F6CB 164B 5A6D
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